(Feldspar) plagioclase, alkali-feldspar (H 6-6. 5).    From Wordnik.com.  [volcanic ash hazards and ways to minimize them] Reference

I was staring a Ca-rich plagioclase and pyroxenes and ilmentite.    From Wordnik.com.  [Snell-Pym » The Moon: a Geologist’s Tale] Reference

A sodium-rich plagioclase, usu. white, occurring widely in silicate rocks; sodium feldspar.    From Wordnik.com.  [languagehat.com: ELVER AND ALBUM.] Reference

The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.    From Wordnik.com.  [Feldspar] Reference

Of course plagioclase feldspars are also one of my favorites so I might be a little partial here.    From Wordnik.com.  [Archive 2008-09-01] Reference

Most of the larger oxides and plagioclase are interstitial, having grown in the intercumulus pore spaces.    From Wordnik.com.  [Lunar regolith] Reference

He called them 'plagioclase stress inclusions' – tiny bubbles of metal that apparently had been rehomogenized during deep ocean pressurization events.    From Wordnik.com.  [Deception Point]

The name was afterwards applied by G. Tschermak to those plagioclase felspars which lie between labradorite and anorthite; and this has been generally adopted by petrologists.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

The continuous series produces light-colored rocks rich in plagioclase feldspar minerals.    From Wordnik.com.  [Featured Articles - Encyclopedia of Earth] Reference

It was anorthosite, the peculiar rock that consists almost entirely of plagioclase feldspar.    From Wordnik.com.  [About.com Geology] Reference

A coarse dark green rock whose principal constituents are pyroxene plagioclase and magnetite.    From Wordnik.com.  [The Long Labrador Trail] Reference

These rocks are composed predominantly of the minerals plagioclase feldspar, amphibole, and pyroxene.    From Wordnik.com.  [Featured Articles - Encyclopedia of Earth] Reference

In that model, plagioclase-rich rock rose to the upper crust as a result of reheating after an ocean of magma had already crystallized.    From Wordnik.com.  [Scientific American] Reference

As magma moves up toward the surface, it loses water and the amphibole reacts, forming a rim containing plagioclase, pyroxene, and oxide minerals.    From Wordnik.com.  [Latest Articles] Reference

Dacite lava hand sample, with abundant amphibole and plagioclase feldspar. magma mixing or crustal assimilation (by another magma) to form the dacite.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

A soft extremely fine grained gray rock, with a well developed schistose structure, carrying much magnetite, plagioclase, orthoclase and their alteration products.    From Wordnik.com.  [The Long Labrador Trail] Reference

Perhaps 75\% of this is the plagioclase feldspars (mostly albite, oligoclase and labradorite) with the remainder as potassium feldspars (mostly microcline and orthoclase).    From Wordnik.com.  [Netvouz - new bookmarks] Reference

Partnering with NASA, the USGS this summer plans to collect four or five tons of calcium-rich rock, or plagioclase, from the Stillwater Mine, the first batch of the 50-100 tons NASA needs by 2011.    From Wordnik.com.  [Missoula Independent] Reference

But if you restively do it for the auto financing bad credit alexia homewards it sabayon yuletide disconcertingly canulisation than apprehension plagioclase of thickly of pandanales pollacks that are intimidated.    From Wordnik.com.  [Rational Review] Reference

That is the textbook definition, but some other typical characteristics of dacite lavas (or magmas) is the presence of certain minerals: plagioclase feldspar and hydrous minerals (containing water in their mineral structure) such as amphibole (typically hornblende) or biotite mica.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

The severe crushing to which the rock has been subjected has resulted in the conversion of the plagioclase into scapolite and also in the formation of zoisite by the characteristic alteration of the lime bearing silicate of the feldspar in conjunction with other constituents of the rock.    From Wordnik.com.  [The Long Labrador Trail] Reference

2. 5-2.7 plagioclase.    From Wordnik.com.  [Chapter 6] Reference

Natron, halite, hauynite, plagioclase, oligo-clase, sodalite, glauberite, cryolite, glauber salt.    From Wordnik.com.  [13. Glaze oxides] Reference

Slide 14: Gabbro • Dark-colored, coarse - grained intrusive • Similar composition to basalt-plagioclase feldspar with some pyroxene and olivine http: / / www. volcanoworld.org / vwdocs / vwlessons / lessons / Slideshow / Igrocks / Igrock8. html.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference